Keto Raspberry Mug Cake
Craving something sweet but don’t want to derail your low-carb lifestyle? This keto raspberry mug cake is the perfect quick and easy dessert. Made with simple ingredients, this fluffy and flavorful cake is ready in minutes, making it ideal for those moments when you need a guilt-free treat. The tartness of fresh raspberries pairs beautifully with the subtle sweetness of the cake, while the hint of lemon zest adds a refreshing brightness. Plus, since it’s made in a mug, there’s no need for complicated prep or cleanup—just mix, microwave, and enjoy!

This post may contain affiliate links. Please read my disclosure policy for more information.
Coconut Flour in Mug Cakes
Coconut flour works well in keto and paleo mug cakes, especially when paired with ingredients like eggs, butter and a touch of acidity (like lemon juice) to balance its slight natural sweetness.
Ingredients
Grab these ingredients and get ready to make your mug cake!

- Coconut Flour – A low-carb, high-fiber flour that keeps the cake light and slightly moist. It absorbs liquid well, so a little goes a long way.
- Egg – Acts as a binding agent and gives the cake a soft, airy texture.
- Sweetener – Adds sweetness without the carbs; options like allulose or monk fruit work best.
- Raspberries – Provide natural tartness and a pop of color, along with antioxidants and fiber.
- Baking Powder – Helps the cake rise, making it fluffy rather than dense.
- Butter – Adds richness and moisture to the cake. Coconut oil can be substituted to make this dairy free.
- Lemon Zest – Enhances the flavor with a bright, citrusy note.
- Lemon Juice – Adds a bit of acidity to balance the sweetness and deepen the raspberry flavor.
How To Make Keto Raspberry Mug Cake

Beat the wet ingredients together.

Add the flour and baking powder.

Stir in the raspberries.

Microwave and serve!
Recipe Tips
- Choose the right sweetener – Use a keto-friendly sweetener like erythritol, monk fruit, or allulose for the best taste and texture.
- Don’t overmix – Stir until just combined to keep the cake light and fluffy.
- Microwave time may vary – Depending on your microwave’s wattage, your cake may take anywhere from 60 to 90 seconds to cook. Start with 60 seconds and add more time if needed.
- Use fresh or frozen raspberries – If using frozen raspberries, don’t thaw them beforehand to prevent excess moisture in the cake.
- Enhance the flavor – A dash of vanilla extract or a sprinkle of cinnamon can add extra depth to the flavor.

More Keto Mug Cake Recipes
Enjoy a small dessert with these other low carb mug cake recipes:
Almond Flour Chocolate Mug Cake
Keto Chocolate Peanut Butter Mug Cake

Keto Raspberry Mug Cake
Need Metric Measurements?
Use the button options below to toggle between US cups and Metric grams.
Ingredients
- 2 tablespoons coconut flour
- 1 large egg
- 1 tablespoon monk fruit sweetener or other sweetener
- 1 teaspoon baking powder
- 1 tablespoon butter, melted
- 1/2 teaspoon lemon zest
- 1 teaspoon lemon juice
- 4-5 raspberries
Instructions
- In a microwave-safe mug, add the melted butter, egg and lemon juice. Mix well.
- Add the coconut flour, baking powder and lemon zest. Stir until well combined.
- Gently fold in the raspberries, slightly mashing them for a burst of flavor throughout the cake
- Microwave on high for 60–90 seconds, or until the cake is set and fluffy.
- Let it cool for a minute before enjoying!
Notes
Nutrition
The information shown is an estimate provided by an online nutrition calculator.